Front brake discs how long?

[kererra]

Hi I purchased a new GLB just under two years ago, at the first service and 5000 miles I reported a "kicking" from the brakes and was told its fine, the second service at 12000 has just taken place and whilst the "kicking" is no worse I mentioned it again. Its just had new discs fitted as they were warped along with new pads @ £490. Should this not be covered by warranty at such a low mileage. The dealer has told me wear and tear is not covered!!!
ps its a Glasgow dealer

 

[KennyN]

Discs + pads are classed as consumables , will be a tough job to get them replaced under warranty.

Did you feel that the discs were warped or were they replaced on the say-so of the dealer ?

FWIW , £490 using genuine discs / pads / sensors and possible caliper bolts is still expensive but not worth jumping off the Erskine Bridge over.

Normally and totally dependent on driving style + usage , 25k ish from front pads / discs at 50k , rears 40k plus and discs at 80k.

Discs + pads are a good earner for the dealer , replaced my pads today as i was told that the rear brakes were needing replaced the last time the vehicle was in at the dealer , on removal the rear pads were around 60% worn and the discs were >50% worn so with my annual mileage i could have got another five years from them but who doesn`t like a new set of brakes.

K

 

[ray_hennig]

Its just had new discs fitted as they were warped

We had tremble under braking so replaced discs and pads at the front.

Less trembling now, but still some. Have we got new, warped discs?

The new discs are ATE, made in China.

Who knows?

I did then buy a set of genuine MB discs but haven't fitted them yet.

How the cash disappears!

RayH

 

[W1ghty]

We had tremble under braking so replaced discs and pads at the front.

Less trembling now, but still some. Have we got new, warped discs?

The new discs are ATE, made in China.

Who knows?

I did then buy a set of genuine MB discs but haven't fitted them yet.

How the cash disappears!

RayH

Probably wear in the front control arms buddy .

 

[ray_hennig]

Probably wear in the front control arms

We've done a lot of checking in that area and so did the Controle Technique (MOT) guy a couple of weeks ago.

Control arms replaced 2017, together with just about everything else!

R

 

[keith of kent]

I've heard it said that if you keep your foot on the brake after heavy braking (maybe at a motorway exit) the pads clamping on that part of the disc can cause warping.
Also if the hub to disc surface is not cleaned/derusted when the discs are replaced the discs will sit unevenly on the hub and warp. My wife had this a number of times with a Peugeot 406, it was only when it went to a different main dealer that the problem was resolved

 

[alecmascot]

I've heard it said that if you keep your foot on the brake after heavy braking (maybe at a motorway exit) the pads clamping on that part of the disc can cause warping.

The action you describe does not warp the disk, but can leave a deposit that causes juddering on subsequent brake application that is commonly mis-interpreted as a warped disk.

https://www.centricparts.com/media/technical_bulletins_docs/Centric_and_APC_Technical_Whitepaper_B1-Warped-Brake-Disc-8-2018_1.pdf

 

[Petrol Pete]

OP , in my opinion warped discs is not a 'thing' on a road car , they are big heavy things (11 + KG) designed to be used by drivers of every skill level , last a while and keep the car manufacturer out of court/jail if they fail = over engineered.

It would be interesting to see if the dealer who replaced them ran a DTI on them while on the hubs and/or in a lathe ......highly unlikely.

As Kenny says #2 replacing brake parts is a good earner for garages.

 

[DSM10000]

Hi I purchased a new GLB just under two years ago, at the first service and 5000 miles I reported a "kicking" from the brakes and was told its fine, the second service at 12000 has just taken place and whilst the "kicking" is no worse I mentioned it again. Its just had new discs fitted as they were warped along with new pads @ £490. Should this not be covered by warranty at such a low mileage. The dealer has told me wear and tear is not covered!!!
ps its a Glasgow dealer

The dealer has no way of knowing how the vehicle has been driven so brake parts and other consumables are never covered unless you can prove a manufacturing defect.

 

[Sally]

My c class just had rear discs at 38000 front ones still original which I find odd

 

[MSG2004]

My c class just had rear discs at 38000 front ones still original which I find odd

is it a 4matic?
my gle a 4matic needed new pads on the rear first at at/about 21.5k miles - as a reaction I had the fronts changed at/about 23k

 

[OneForTheRoad]

My c class just had rear discs at 38000 front ones still original which I find odd

Some rears are solid discs and only 10mm thick . Fronts are ventilated and can be upto 34mm thick .

 

[Sally]

Yes it is a 4matic. Does that make a difference ? It’s an amg line so has big discs on the front

 

[rf065]

is it a 4matic?
my gle a 4matic needed new pads on the rear first at at/about 21.5k miles - as a reaction I had the fronts changed at/about 23k

My rears needed changed at the same mileage, but is still on the original front discs and pads at 47,000, I think you might have jumped the gun there!

 

[MSG2004]

Yes it is a 4matic. Does that make a difference ? It’s an amg line so has big discs on the front

I guess it does as I was staggered when my rear pads were worn more than the front - I replaced front and back within a few months of the other before I got the brake pad warning light. I''ve had a car since passing my test at 17 about 45 yrs and never ever experienced rears wearing more than front

it could be as/IIRC often 60% of power is to the back and 40% to the front,

Note. The discs are still ok both front and back have some lip and passed mot a week+ ago - front are ventilated back are not but they look like the same diameter. I guess more pad-wearing equates to more disc-wearing.

 

[rf065]

I guess it does as I was staggered when my rear pads were worn more than the front - I replaced front and back within a few months of the other before I got the brake pad warning light. I''ve had a car since passing my test at 17 about 45 yrs and never ever experienced rears wearing more than front

it could be as/IIRC often 60% of power is to the back and 40% to the front,

Note. The discs are still ok both front and back have some lip and passed mot a week+ ago - front are ventilated back are not but they look like the same diameter. I guess more pad-wearing equates to more disc-wearing.

Rears wear due to the brake hold function.
4 matic has no bearing on your brake wear.

 

[OneForTheRoad]

I guess it does as I was staggered when my rear pads were worn more than the front - I replaced front and back within a few months of the other before I got the brake pad warning light. I''ve had a car since passing my test at 17 about 45 yrs and never ever experienced rears wearing more than front

it could be as/IIRC often 60% of power is to the back and 40% to the front,

Note. The discs are still ok both front and back have some lip and passed mot a week+ ago - front are ventilated back are not but they look like the same diameter. I guess more pad-wearing equates to more disc-wearing.

Is your Gle the 250 version. ? The rears also act as the handbrake ,plus friction material on the front pads is alot thicker than that of the rears.

Mb recommend I change discs and pads on my glc at around 33k . I share the brakes of the likes of E43 , E400 , E450 . Not small and not cheap.

 

[MSG2004]

Is your Gle the 250 version. ? The rears also act as the handbrake ,plus friction material on the front pads is alot thicker than that of the rears.

Mb recommend I change discs and pads on my glc at around 33k . I share the brakes of the likes of E43 , E400 , E450 . Not small and not cheap.

Yes thanks it is a 250d
Amgline - it had done about 22k IIRC when I had them changed, rears first then the front - discs have small lips but passed mot the other week, mot not due of over 12 months now
MB quoted around/clse to 400 for the rear pads and front were about 340/60 IIRC - got bremo pads rear and front IIRC and new brake swear sensors though the oldies were not activated - around 130 for the back and 125 from inc parts/abour and VAT

 

[ALFAitalia]

OP , in my opinion warped discs is not a 'thing' on a road car , they are big heavy things (11 + KG) designed to be used by drivers of every skill level , last a while and keep the car manufacturer out of court/jail if they fail = over engineered.

It would be interesting to see if the dealer who replaced them ran a DTI on them while on the hubs and/or in a lathe ......highly unlikely.

As Kenny says #2 replacing brake parts is a good earner for garages.

I've replaced quite a few badly warped discs over the years....including on my own cars.....It certainly happens. Lots of the cheaper aftermarket ones (prob Chinese or orther far east sources ) seem to warp all too easily when compared to the big brands and factory fitted ones.